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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02229a11206aadfe6cbd79639e777ffa19a607bf973c674d85ccd6de71190bf7' 
  AND token = 'B2nU4TQzAzW1IFXoEcBlMer0MW3HxlVMWSYf8bJ+HIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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