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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b12cc0ebb55fe0a5ad8ff62647b4334bfd198bc7aa4278814fa3dab86a4845' 
  AND token = 'hEKZB85h9aBo1IlTARWRBSPdXowsGwfI+OP6HmYsMb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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