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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97964273941fa70dd16b81aad5c48450d655c6ed9a7660e2f9055859e41281a' 
  AND token = 'TasBafJyQrY+3Q/XBukvuulRN57gW0beBuV5M+65HwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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