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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e464a6af6db236f72b64e6108bc7a6c8f80380a0a1ea62c88e35c0979a0176' 
  AND token = 'ckn79+NSuz38DEdhJTZq4p0l5eaPoblpQNDSpdXMrNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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