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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4167a2dba54c578979981e249cc0aaddf7d03806b98ae6ea5c546bf87225871' 
  AND token = 'O384dw6oKMF9hHAn4bThI+pX6PjB0lZGtFVL0GksP4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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