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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e66bf99901349d80b41d31d01772d26b0e56f762ccb6abc36b79d6c39ed80e' 
  AND token = 'asYHYFJqE1IONxkt618bd2Tcztlarn8Ale9jixxC6/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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