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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7249b63897382e3a43b42b6bd7db20250dd690b2ed1d175ec32a35d444139c7' 
  AND token = 'TqmjyFh2Q62lD2376SsV8AqwTI3kyp1CDrigLVNdlGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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