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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9a02c9ee515c468a51018128f6a9a24a248cf1625f430f17a0f6af6f93f265' 
  AND token = 'jFYV//9fSCVGOQXxF2661d4Fksw08j5Pm+o1jlz/44k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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