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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbeccdb4f795a36e5185407905b78109d0a1305cae0b33c4b765e33efd84bc6' 
  AND token = '5LwYNtccI7TRkxJOqauwhiaWvvYqDYn8a7nKZtT80V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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