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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95150084ef9987baab2ffaf71a8025a8b1781f32bf1b5a5de441d82658a3bfd' 
  AND token = 'jQCSP3H0BZThTNpZqfCqpxFENI58oFaXvULvGML3MHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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