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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9ac39d86c61746c4d630b998ea579052e42cbdd46b3d20b11e2deb2582d925' 
  AND token = '9nKlwcY0NcDRsNWpepZrvciFHlxWFCV8y9PoqzoDJsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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