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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb3fd9806af0b317fc7e0014966ffdca3395eca77430d74e76dc0a77077e6d7' 
  AND token = '35IGn+U3oarIq6Jn9wyMxJyooNrHvrT9PhWLJGXAlZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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