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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55515ab494bcda2860de5300e83dbc779a5f3d53c3c49addfd7d878b35c6688f' 
  AND token = '6Gn1FiReeuy/WamSv40oCxH6K0xpVywsR+C/QmkDJxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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