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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af036b656d70e51ee97d4e569f89de14cafc722e36a90f47babf993f1d023ee4' 
  AND token = '4OZJZCRx/CB4NESgsHN7WwO1UR3ltlS2kZhEoctTBhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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