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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1316bb20e445cae39c2e96b9709c4d9e588759615ce5a5071c89687d3d5ee5b0' 
  AND token = 'dZSrdeqt8XnCpnkqu3z6mNdKZ3FkFFhhKZCSVwEk7Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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