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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad36de5f836356218e08f48d146b4869b9c382cecbcb65eca9feed790b60524b' 
  AND token = 'EJEDTx62V5maRHOdaiYW6aJLm3ohdutmRhrJf1hkVbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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