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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e4e79323946599a168cdcd7c719ae4669ff44db9f29711ca41b0a8c368c437' 
  AND token = 'xDW3EI8DrP0H+6diana66iwckZwl+PrZe+KCqYxBCeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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