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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0f5a72f5a92c03ae5d4fe81a873012a566e80016d27a9d775888e4f209318b' 
  AND token = 'nkT6ip+2ncxQED0lKKlhU/99RbKVNZmcMheIGExzphE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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