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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c289fb3796a9de8492f2174552e9d7ab5c753d0270671d1db42273b8bb4915' 
  AND token = 'si+E9aG+3s2jBRQKyy/7iCWvpzfwf107qvOJ4b4tGI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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