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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29788797c9c8a9179fd0ded55a94ee2ee75cd0009337771c738d047c9ba962c' 
  AND token = 'CWu7+ON784J9FJbj1xLK4ZDGmwYIf24lN9krWv9CQP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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