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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1481e74c686ef389b3a1c48c458160864edd7327737f4cee3477f1ab270adfe3' 
  AND token = 'ybgmvQ+We+dHDXpkmYckBcRBVXKJkOGqF/egE/UKHOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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