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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b88c93def882f88a9db2f989d82d62d57372f9fb3d8a0448e3a4f6a5e2d768c' 
  AND token = 'KVLhmG20kCSuOU7QGtvoc+NEymIB6EXeeBAvGzF5mn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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