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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb354be7e820c27b98d7af4ae829da126d12ee90eac950efa54de376ca427b9' 
  AND token = 'a8ZC88P7KfZIpgDTadom38WgxtiPZIxv0psPxV6kFpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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