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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7874e6f1913788c83ffa9ee2a6f07b3a44e0a4de12073e563efb7ae8d32ba6f8' 
  AND token = '3HnbD03wprXu+Bv2ppfhpxarDAgYFz5TVq0QwFf54ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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