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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5244047afc3e6504e1c3da1fd8bc66b1cd9172d3e19b90f18ddd0418e2a07bd' 
  AND token = '2D1IGH5MaP88J1ka+xj8AOK7BhjBr3XoZ0FTw50su7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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