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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec34c1114f9bf3e9e4b72639eb86c793513590f012048e8e226d5d2ffcf7b14c' 
  AND token = 'rwA3J477N1O6vZ0vwXJOQB1oREyjzov/9Tcpce+7mz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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