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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2c4dff187eff3c0cc5e33fad909fa92c543f447d109fc303d7a1c2703c053b' 
  AND token = 'Z7ftbkyRjM5JvXmbxcyOZ4iyJ/jC/JNbLNARm2iNAws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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