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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b8299f5a44981c26a0e622d2271e019d179d9efdfd4ffb970ebd240f993555' 
  AND token = 'eWtIzL3AjPm82PEaPR+bynurinqsT8IYMc2xlrUDOxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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