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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b2eef8f8257277e1a38157fea6a7225970c35477128039433eff63d9991f42' 
  AND token = '8rivAUhAeXvMrmP8xiBHlZ8tQEKfUOXQKKvu60+IGC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}