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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bbd7dec857ac1e0b6c4a173ab054958c7d21f19f1589a2c2961d14cb8d541b' 
  AND token = '5BuUhAjpsXshSXEH1NgeYfsIuyZonwt7+v5oJqyMou0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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