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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c912b397cf786585cc80d4ef4b003350d34b642cdea60d32750a18c5983455d9' 
  AND token = '9hENKylA7KPDoW15GHURkgK3w4TxsLacA+chbGvbfrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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