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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c974330fdf7ee3326a14f5d2dbe63cda9c900c0dd48a2bd60cf5dbb06f91f5' 
  AND token = 'VYCzquhkwbJRYb318yQdSt5/lgznhUY36JJI2hgrbWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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