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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc627d783cb36786457c0f425c3d4733ab394110309f06e84ebd5138c16c8c8' 
  AND token = '4zayb7A5xtRsIz2RR2Q0e8zm3YltyNLezT22DpY7F20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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