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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5cec8b49b32a30f6ada31e88c40d260fc48c241012aca44a2e1bc7c7965a8b' 
  AND token = 'UE1a/CyWNidy6sswxLncZH1lakd/oogzC33WMs87UBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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