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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d96f8b44957868c2b1425d462b62fe058e0b16e9c9105bbd3cd60ee1f31ce6d' 
  AND token = 'D59uH66GHZJ5H3TMEK1sYibjIcC6BCWLBBWZVuuFNJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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