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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8334ff800e27f5740be38e6a1006f7bc7627592e96fd4592e909939791142836' 
  AND token = 'QLKxdQUQAVVmHay4UhQCceOfAXA+e0en35e14MvgAwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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