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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b3bc4c5940a3524832ed2be0e6854c95a10914ad362a9bf83e3444d7dcbfac' 
  AND token = 'qTkgOTB1cJjf1wlOZVRnp5DetPv8eAeangK68n3gucs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00304

JSON explain

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