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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef1f0c6eda8e0b226cb16fbae7660ee78ae9b234b7924b40bb07fe3c47d30ff' 
  AND token = 'jvovFQDudw3FFPRPVobcja8XLhvFb4mb72yMZXQv5Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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