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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc5eea98c89e3d72004fb37dbae2ff4f6c9d4ffa4cafb118633a5e19b5b8183' 
  AND token = 'Tg7aubkBWC8Zz8xjoh9PJpbcPAE9/RaejC3T+lcHkVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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