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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998c1ac6a0c0076c4d385f95a285a5350fffd7ff4f55f795d07cfb6cab07efe0' 
  AND token = 'sh5DoEyvuYy+ISIHzGgppibOzZjKW8MlI2F/ONjGceI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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