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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09802c65a45161c4343524cb1c4c918f541daf40108de017ad199836cfe317f8' 
  AND token = 'uN0lTJC4clL0tVEFTObpmNXbEjI3jx+g9JGbB0iUByk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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