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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3506672209d4f3fc439847cd84395101de00272e48ee6169bb32da614aace6' 
  AND token = 'Hh9Xlc80V7u8JI3OiX3ceoMvCIxSiGCrhg0cbOdVQ+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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