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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32d9e4c944441cdb68baeb935ada483a553c57981d56c026eb514cdfb48a2d9' 
  AND token = 'MssSV3ILG5Xvj9Ko5zl3Dwm7EJvrj9q0eF0Nfw3geSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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