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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657c46ebe93486da0953473419961866513a9bf746b764010169ff6e5e7d7cfb' 
  AND token = 'm6LC2n2boHJHQIaM9nmqicVEEMwsI576ddMlwgG2gQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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