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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f78506ff29c60c965301e73972c78399dcf3b65ae15eb94b878bab98990456' 
  AND token = 'mIKdQmh/e/+tmMHXI0L7zb7o1q45jTZ1ECRui9LS+8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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