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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f0118bad42b6e45d64a4b7d18c2841140fcbce744da67383a95ff142e93624' 
  AND token = 'eda0OUuYgYoxYbcslN0YHhViqd7WCFzk/GNVCgzHOEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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