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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf57eaadbcf4b05687cc423a83c2bede25aa6fe23f24dbd49c372ed0d57b88f8' 
  AND token = '42COD9TvFM6UCFPxhv+sHDbaD5PimHIKIQtr3GCM9yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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