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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d423dc30564a45f6845c22e4466c4a7aa1804a4cb4df94e7bba6cb2a53b4c8' 
  AND token = 'yr/1V++FmmvhO+4Wj6RMSmPB1rC7hspGVh2zZu0QJ34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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