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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc225fb4972b5553c6e3c19424b2365e9851064460f287afaaf6b153546f7475' 
  AND token = 'nfkrEC+ds0/C3HOar3n2tcGWbz0O87VCb5ysktxZJJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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