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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8f87e18db712b508b6867356e4679801ecff872ab5549603cfa39a931d9763' 
  AND token = 'Og7w+G3JiW3z+UA/diyiZX6glQrP7izAc76Ig+WaPI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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