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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73cc085522b0e875a29e08341e0a68c7e8ce21b4d66928aa0ba6aad9ea8b6821' 
  AND token = 'bmQHRqM0pu0sDjP6UE7zClWSfZINz51y7gfjShUJ8DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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