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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11138674b5773ddb927abe276706c31ece92eab302264593238229f37853de0' 
  AND token = 'paP6YMA80HDcv2ZGW8z78zXtTXAAv1l4uGME2M/pXb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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