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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2ec1a1d3dfc59af6fe6880c9d07a8a2d1bb1bc929c0ed81dc36f1e39325055' 
  AND token = 'CiUK2fxO90seXQeCLDlgQ8hY9H9HItJHqTiKb3h8VX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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