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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02bce5038eef35c3b887e10196a9fb3bad6736da089600ebce3e8ac1e485a60e' 
  AND token = 'PW8kErqepn/sXwTIYh5CaD/dZWxd37vDguZC8lRKnyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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