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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc7e40b68b54aa850628bba3ae568c6d6e6481ed0fb9e0d577eeb8f7fac81c2' 
  AND token = 'vwlp5kYFnm/CK64+jUBBBUikd9Eqoxud7BYcNgUt6ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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