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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0435cc0bd7595f1f3a43f901833c2616534ed036ad491b3ef2bcce6af5b71d64' 
  AND token = '79XDuI4mqcMVR1d8KiBmM9p0t4kms7KLufzcjaPssv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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