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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242410e88f8bc5426af1b28dfc27fffaa940d5bc2abfaa4363d153a254b7f3c0' 
  AND token = 'eyQhlxpIhNh22iN4VZmT+A8Sh6nTlAn/7tttOszUnF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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