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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cf9d7b14137bf59886cc2ef7c707db44867dad9da8641b655e673b5ed40978' 
  AND token = 'wa++Jvw6nH+xbT0+xVwH1e83s23ZjfiSmRj0vC2iXKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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