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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac8ca74cadc837568d746f09cbdc6e00d6c029ba08b5b91c9a5889fe61c3838' 
  AND token = 'xJqPdL1AiPq0T0X+vs9UC99mSVHM89Jd3Jo0cWk1zpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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