Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19429423480b5409222d802cfaad7a59f559c1906e12943c4b6b27b6a358bc4d' 
  AND token = 'nRaen0QNLDWy3pryO2lS+d8nYiwjtlRj2tvQOhQeJjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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